Within general art, this usually refers to an often light-hearted imitation of another artist's style. More broadly, this can refer to art which uses the style or pieces from an earlier production as central pieces. This can be poor imitation (like much of fan fiction and fantasy literature), but can also be innovative, such as the film Moulin Rouge which used verbatim popular songs in an unusual musical. References: Narrativism: Story Now Pastiche in Roleplaying

An imitation of a renowned artist's work consists of a number of motifs copied from authentic works combined into a new work in such a way as to give the impression of being a newly discovered original by that artist.

A work of art that imitates the style of some previous work, like a musical medley. A term (used by literary critic Fredric Jameson) that describes the toneless quotation of earlier artistic styles in contemporary or postmodern works.

a literary, artistic, musical, or architectural work or portion of a work that is clearly recognized as the imitation of the style of previous work, often with satirical intent. generally possessing a negative connotation.

A work of art made in admitted imitation of several style of other works. A composition of incongruous parts; a hodgepodge or pasticcio. Often a pastiche is made in order to ridicule the style of the artist it imitates.